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Vegetarians and Vegans Because B12 is primarily found in animal-based foodssuch as meat, eggs, poultry, and dairyvegetarians and especially vegans are at high risk for deficiency

What the Authoritative Sources Say About B12 Deficiency and Supplementation The National Institutes of Health Office of Dietary Supplements publishes the most thorough citation-backed overview of vitamin B12 its role in red blood cell formation and neurological function, the populations most at risk for deficiency (older adults, people on long-term metformin or proton pump inhibitors, vegetarians and vegans, people who have had gastric bypass surgery), and the recommended daily intake at each life stage

To put this simply, it wears off - it does not last

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